Radio receiving set



May 20, 1930. G. H. FISHER I 1,759,610

RADIO RECEIVING SET Filed April 16, 1925 I Patented May 20, 1930' UNITEDSTATES PATENT oFFicE M GEORGE H. FISHER, OF NEW YORK, N. Y.,

ASSIGNOR TO BELL TELEPHONE LABORA- TORIES, INCORPORATED, OF NEW YORK, N.Y., A CORPORATION OF NEW YORK RADIO RECEIVING SET Application filedApril 16, 1925. Serial No. 23,467.

This invention relates to a radio receiving Referring particularly toFig. 1, the main set with a novel arrangement for mounting adirect-acting loud speaker associated therewith.

An object of this invention is to provide a self-contained radio setcomprising both the receiving and the loud speaking apparatus. Furtherobjects are to provide portability, flexibility, compactness, andprotection for all of the apparatus.

Another object is anovel type of direct-act ing diaphragm. I

In general, this invention comprises radio receiving apparatus and adirect-acting loud P speaker such as the cone type compactly con--tained in a cabinet so designed that when in operation the cover of thecabinet may be opened to expose the direct-acting loud speakerin thedesired position for operation. A

1: form of loud speaker diaphragm which may advantageously be used inaccordance with the invention is one of pyramidal shape.

Where a loop type antenna is to be used the invention also provides formounting itin the cover of the cabinet so that it is also p" sitionedfor use by opening the cover.

In accordance with a specific application of this invention, thepyramidal or cone type loud speaker is located, together with the loopantenna, in the cover of the. cabinet housing the radio receivingapparatus. The mounting of the various parts results in an arrangementwhich is pleasing in appearance,

I is compact and makes for convenience and efficiencyin operation, sincethe parts can be quickly adjusted to the position in which they givethemost satisfactory operation and whennot in use'they are stowed in. asmall space and are protected from injury, dust,

etof i I Y Referring to the drawings, Fig. 1 is a general assembly viewof the set open for op-' oration, this embodiment employing thepyramidal form of loud speaker. Figs. 2 and 3 are top views of the casedesigned for round and for elliptical conical shaped directacting loudspeaker diaphragms, respec tively. I

Similar reference charactersdesignate similar parts in the differentviews.

portion of the cabinet or case contains the radio recelvlng apparatus.The cover 11 hinged to the mainportion of the cabinet containsthefdirect-acting loud speaker and loop antenna. The front side of thecabinet has two doors l2 and 13 which are open when using the set togive direct access to the tuning or controlling dials shown. The frontpanel of the radio receiving set is shownat 14 andthe top at 15. l/Vhenthe cover 11 and the side doors 12 and 13 are open, complete access isgiven to all parts of the radioset necessary for its operation andforthe replacement of vacuum tubes, etc. Connection of the antenna andthe loud speaker is made with the receiving set at the binding posts 19is supported by a truncated pyramidal section having its base joined tothe base of the front section 19. The rear side of the directactingdiaphragm facesthe top of the cover made of open grillework 20 and linedwith thin fabric 22, which alfords protection and I shuts out dust andat the same time affords substantially free passage to'sound vibrations.The open work at the top of the cover may be employed where it isundesirable to place the direct-acting diaphragm in close proximity to asolid, back. The diaphragm and its driving element are supported at therear by means of ring 21 fixed to the grillework or to any othersuitable means in the cover of the cabinet. f

' The direct-acting loud speaker may be the cone type, such as describedin the Scientific American of December 1924, page 390, with a drivingelement of the type disclosed in Patent No. 1,365,898 of January '18,1921 to H. C. Egerton. Figs. 2 and 3, which are top views of the cover,show by the broken lines the mounting ring 21 for supporting thediaphragm and the driving elementpan d the periphery of the diaphragm.Fig. 2 shows adiaphragm having a circular periphery 23 and Fig. 3 onehaving an elliptical periphery '24. The elliptical diaphragm iseccentrically driven and eccentrically supported as shown by theposition of the mounting ring 21 in 7 Fig. 3, the apex'of the diaphragm,and the point to which thedriving element is attached, being directlybeneath the center of 'the ring21 as seenin Fig. 3. The direct-act ingdiaphragm has arelatively large area and may obviously be rectangular,round or elliptical, as illustrated by the several figures.

The position of the cover 11 when open is secured bymeans of the rod 25and the screw 26, which aifords'means of adjusting it at any desiredangle of opening. 7 V

It is to be understood that the invention is not limited to the specificstructures described and illustrated since many modifications within thescope of the appended claim may be made'without departing from thespirit'of the invention.

What is claimed is: A rad o receiving set comprising a cablnet, radiorecelving apparatus mounted therein a hinged cover for said cabinet,. agrille forming the surface of said cover,-a' directacting diaphragmmounted on said grille with its main radiating surface facing the insideof said cabinet, and substantially dust 'proof fabric mounted over saidgrille for protecting said diaphragm and said apparatuswhen the'coverisclo'sed.

. In witness whereof, I hereunto subscribe V myname this 13th da ofApril, A. D; 1925. r RGE H. FISHER.

